<template>
  <div>
    <el-form label-width="120px">
      <el-form-item label="讲师名称">
        <el-input v-model="teacher.name" />
      </el-form-item>
      <el-form-item label="讲师排序">
        <el-input-number
          v-model="teacher.sort"
          controls-position="right"
          :min="0"
          :max="10"
        ></el-input-number>
      </el-form-item>

      <el-form-item label="讲师头衔">
        <el-select v-model="teacher.level" clearable placeholder="请选择">
          <!--
            数据类型一定要和取出的json中的一致，否则没法回填
            因此，这里value使用动态绑定的值，保证其数据类型是number
          -->
          <el-option :value="1" label="高级讲师" />
          <el-option :value="2" label="首席讲师" />
        </el-select>
      </el-form-item>
      <el-form-item label="讲师资历">
        <el-input v-model="teacher.career" />
      </el-form-item>
      <el-form-item label="讲师简介">
        <el-input v-model="teacher.intro" :rows="8" type="textarea" />
      </el-form-item>

      <!-- 讲师头像：TODO -->
      <el-form-item label="讲师头像">
        <!-- 头衔缩略图 -->
        <pan-thumb :image="teacher.avatar" />
        <!-- 文件上传按钮 -->
        <el-button
          type="primary"
          icon="el-icon-upload"
          @click="imagecropperShow = true"
          >更换头像
        </el-button>

        <!--
v-show：是否显示上传组件
:key：类似于id，如果一个页面多个图片上传控件，可以做区分
:url：后台上传的url地址
@close：关闭上传组件
@crop-upload-success：上传成功后的回调 -->
        <image-cropper
          v-show="imagecropperShow"
          :width="300"
          :height="300"
          :key="imagecropperKey"
          :url="'/eduoss/fileoss/uploadOssFile'"
          field="file"
          @close="close"
          @crop-upload-success="cropSuccess"
        />
      </el-form-item>
      <el-form-item>
        <el-button
          :disabled="saveBtnDisabled"
          type="primary"
          @click="saveOrUpdate"
          >保存</el-button
        >
      </el-form-item>
    </el-form>
  </div>
</template>

<script>
import teacherUtil from "@/api/teacher/teacher";
import ImageCropper from "@/components/ImageCropper";
import PanThumb from "@/components/PanThumb";
export default {
  //申明组件
  components: { ImageCropper, PanThumb },
  // 核心代码
  data() {
    return {
      teacher: {
        id: "",
        name: "",
        sort: 0,
        level: 1,
        career: "",
        intro: "",
        avatar: "",
      },
      saveBtnDisabled: false,
      //上传弹框的组件是否显示
      imagecropperShow: false,
      //唯一标识
      imagecropperKey: 0,
    };
  },
  //监听
  watch: {
    //路由变化的方式，路由发生变化就会执行
    $route(to, from) {
      this.init();
    },
  },
  created() {
    this.init();
  },

  methods: {
    //关闭上传弹框
    close() {
      this.imagecropperShow = false;
      this.imagecropperKey++;
    },
    //上传成功方法
    cropSuccess(data) {
      this.teacher.avatar = data.url;
      this.imagecropperKey++;
    },
    init() {
      if (this.$route.params && this.$route.params.id) {
        const id = this.$route.params.id;
        this.getById(id);
      } else {
        // 使用对象拓展运算符，拷贝对象，而不是引用，
        this.teacher = { sort: 0 };
      }
    },
    saveOrUpdate() {
      this.saveBtnDisabled = true;
      if (this.teacher.id) {
        this.update(this.teacher);
      } else {
        this.save(this.teacher);
      }
    },
    save(teacher) {
      teacherUtil.save(teacher).then((response) => {
        if (response.success) {
          this.$message({
            message: "保存成功",
            type: "success",
          });
          //回到列表,路由跳转
          this.$router.push({ path: "/teacher/table" }); //固定写法
        } else {
          this.$message.error("保存失败");
        }
      });
    },
    update(teacher) {
      teacherUtil.update(teacher).then((response) => {
        if (response.success) {
          this.$message({
            message: "更新成功",
            type: "success",
          });
          //回到列表页面
          this.$router.push({ path: "/teacher/table" });
        } else {
          this.$message.error("更新失败");
        }
      });
    },
    getById(id) {
      teacherUtil.getById(id).then((response) => {
        this.teacher = response.data.teacher;
      });
    },
  },
};
</script>